Core drill



J. W. LOY

Sept. 22, 1925. v 1,554,446

CORE DRI LIL Filed Jan. 12. 1925 2 Sheets-Sheet 1 1 V I 28' Q I 28 I| 6. /4 INVENTOR.

J j 1 3 "W 7 1 .I J 25 v ,j

- ATTORNEY.

Sept 22,1925.

-J.vv.L1)Y

CORE DRILL i ed Jan.

12, 1925 2 Sheets-Sheet 2 Q [N VENTOR.

-Fig. 1; and e Figure 10 is a side elevation of the lower- Patented Sept. 22, 1925.

UNITED STATES JAMES W. LOY, O'F LONG BEACH, CALIFORNIA.

CORE DRILL.

.- Application filed January 12, 1925. Serial 1T0. 1,761.

To all whom it may concern:

Be it known that I, JAMES W. LoY, a citizen of. the United States, and a resident of Long Beach, Los Angeles County, California, have invented certain new and useful Improvements in Core Drills, of which the following is a specification.

My invention relates to a core drill and has among its salient objects to provide, in

combination, a rotating mechanism adapted to be driven by the usual drill stem and a pounding mechanism adapted to be intermittently lifted and dropped during the rota-v tion of the rotating mechanism, the center of said mechanisms being open to receive the core around which the drilling takes place; to provide in. combination therewith means adapted to be closed into the core being cut for the purpose of cutting it off and for retaining the same within the mechanlsm, to insure its removal without loss or injury thereto; to provide in combination therewith means for automatically and intermittently locking a part of said mechanism to the side of the hole or casing, where a casing is used, in order that relativemovement of one part of said mechanism to another part thereof can be accomplished; and, in general, to provide a new and useful mechanism forv taking and preserving a core, which shall be efficient and economical and certain.

In order to explain my invention, I have illustrated one practical embodiment thereof on the accompanying sheet of drawings, which I will now describe. In the drawin s igure 1 is a vertical. sectional View through a mechanism embodying my invention' Figures 2, 3, and 4 are cross sectional views taken on the section lines corresponding thereto on Figs. 1 and 5 Figure 5 is a vertical sectional View through said mechanism on the line 5- -5 of Figs. 2, 3, 4, 6, 7 and 8;

Figures 6, 7 and 8 are cross sectional views taken on the corresponding lines on Figs. 1 and 5;

Figure 9. is a fragmentary side elevation of the portion of the device directly to the left, being the lower right hand side of end of the lifting and dropping device and through which the section line 8-8 runs in Figs. 1 and 5.

Referring now more in detail to the drawings, 12,13, 14 and 15, designate four body members of somewhat segmental form in cross section, mounted through a member 16, shown in section in Fig. 2, said member 16 having a central opening, 16 therethrough, and having set therein, in suitable holes, four springheld plunger cams, each comprising a cam head 17, 18', with stem, 17, 18", with a coiled spring,17", 18", therearound. and a short sleeve, as 17 and 18, adapted to be depressed in a manner as hereinafter described to force the cam heads downwardly for the purpose of forcing inwardly, four dogs. or core cutting devices, 19 20, 21 and 22, shown in section in Fig. 3, the cam heads 17 and 18' being indicated in said figures. On the lower end of each of the four body members 12, 13, 14 and 15,

is mounted a drill or hit member, as 23, 24, 25'and 26, each being removably attached thereto, as by means of a dove-tail interfit,

indicated at 27, Figs. 1 and 9, and each being held in place, as by means of a'set screw,

28. The inner faces of the four body mem- 1 bers 12, 13, 14 and 15 are provided with pockets, as 12, 13, 14 and 15, into which fits and turns the lower end, 29, of a tubular member 30, the lower end of said member being shown also in Fig. 10, and having thereon two spiral cam collars, 31 and 32, each extending only half way round the end of the member 30, as will be clear from the showing made. These cam collars are so arranged and positionedv as to engage the two opposite body members 12 and 14 and lift them and then let them drop as the high ends of said cam collars pass from under the shoulders formed by the pockets 12 and 14", and then the' lower ends of said cam collars pass under the shoulders formed by the pockets 13 and 15 infthe two opposite body members, 13 and 15, and

lift themin a similar manner "and let them drop, thus two of said body members with ber 30, which is somewhat flattened on its four sides, as indicated in Fig. 6, are four holding dogs, 38, 39, 40 and 41, each having the concaved cam surface, as 38, to be engaged by the rounded corner portions of the upper end of said tubular member 30. The outer ends of said holding dogs, 38, 39, 40 and 41, are provided with teeth, as 38, 39 40 and 41 whereby when said holding dogs are moved outwardly into the positions indicated in Fig. 6, they look with the inside of the hole, or casing, as the case may be, as indicated by the circular broken line in said Fig. 6. Said holding dogs are mounted on four pins, as 42, 43, 44 and 45, havingtheir lower ends in said member 37, while their upper ends are held in a collar, 46, as indicated in Fig. 1. Four long bolt like members as 47, connect the lower member 16, the member 37, and said collar 46, as indicated in Fig. 5, with spacing sleeves, or enlarged portions, 47, between the members 16 and 37, and with shorter spacing sleeves, 47 between the member 37 and the collar 46, said bolt like members being screwed into the member 16, at their lower ends, and at their upper ends provided with nuts, as 48, thus locking the mechanism together firmly as a unit, but permitting the tubular member 30, to be turned for the purpose of moving the holding dogs, 38, 39, 40 and 41 alternately out into holding position and inwardly into inoperative positions. The turning of said tubular member 30 also operates the cam collars at its lower end for the purpose 'of alternately lifting and dropping the opposite pairs of body members and their drill bits, secured to their lower ends, as before described. The upper end of said tubular member is provided with a coupling member, 49, by means of which the device is connected to the usual drill stem or pipe, as will be understood.

The operation of the device may be briefly described as follows:

The drill is operated by the rotating of the central tubular member 30, from the usual drill stem, which is connected to the coupling 49. As said tubular member rotates,its spiral collars 31 and 32 alternately lift and drop the opposite pairsof body members, first lifting and dropping members 12 and 1-4 and their drill bits 23 and 25,

p and then lifting and droppingmembers 13 and 15 and their drill bits 24 and 26, this be ng accomplished by the rotating of said spiral cam collars 31 and 32 in the pockets pended claims.

As said tubular member 30 I wall of the hole, the outer mechanisms which are connected by the bolt like members 47, 47, do not turn, and when said holding dogs are drawn inwardly, the entire mechanism turns slightly with the tubular member 30, thus the drill bits are turned as they are raised and dropped in the drilling operation. That is, as the holding dogs -move into holding engagement with the wall of the hole, and during this time the two opposite body members are' lifted. and dropped, the holding dogs are released and the mechanism turns slightly and said dogsare moved outwardly again into holding engagement wit-h the wall of the hole, and during this brief period the other-two body members and their drill bits are raised and dropped, and thus the drilling is continued until the desired depth has been reached. When it is'desired to remove the core, the drill stem is lowered, or released by the derrick block and tackle and settles down sufficiently for the lower end of the tubular member 29 to engage and depress the four plungers with their cam heads 17, 17 18, 18, downwardly and they engage and force the core cutting dogs or devices 19, 20, 21

and 22, inwardly into the core for thepurpose of cutting it off. Thus the core is cut off and retained within the hollow center of said mechanisms by said dogs or cutting devices 19, 20,, 21 and 22, and as the 1nechanismv is pulled from the well the'cot'e is removed intact with it. i

While I have shown and described one practical embodiment of my invention, 1 am aware that many changes in details and arrangement can be made without departing from the spirit of the invention, and I do not, therefore, limit my invention to the showing made forillustrative purposes, except as I may be limited by the hereto ap- I claim:

1. A core drill having an outer part and an inner part with an open center, means for turning the inner part, means on said inner part for raising and dropping the out- -er part intermittently, and a drill bit on said outer part.

2. A core drill having an outer part and an inner part with an open center, means for turning the inner part, means .on said inner part for raising and dropping the outer lll part intermittently, means for intermittently holding the outer part from turning with the inner part, and a drill bit on the lower end of said outer part.

3. A core drill having an outer part and an inner part with an open center, means-for turning said parts, means for intermittently locking said outer part to the wall of the hole, said means being operated by said inner part, means on said inner part for intermittently lifting'and dropping said outer part, and a drill bit on the lower end of said outer part.

4. A core drill having an outer mechanism and an inner mechanism, said outer mechanism comprising a plurality of body members movable longitudinally relative to said inner mechanism, means on said inner mechanism for alternately lifting and dropping said body members, drill bits on'the lower ends of said body members, means for intermittently locking said outer mechanism to the wall of the hole during the operation of said device, and means operable by said inner mechanism for cutting off and supporting a core within said inner mechanism.

5. A core drill having an inner tubular member, a plurality of outer body members connected around said inner tubular member, means on said inner member for alternately, and intermittently lifting and dropping said outer body members, drill bits on said outer body members, means connected with said outer body members and operable by said inner tubular member for intermittently locking said outer body members from rotating, and core cutting devices adapted to be forced inwardly to cut off a core and to support the same within said device, said core cutting devices being operable by the downward movement of said inner tubularmember relative to said body members.

6. A core drill having an inner tubular member with spiral cam members thereon, a plurality of body members around said inner tubular member and movable longitudinally relative thereto, interconnections whereby the turnin of said inner member relative to said bo y members alternately lift and drop said body members, drill bits on said body -members, holding dogs con nected with said outer body members and adapted to be operated by said inner tubular member to intermittently hold said outer body members from turning, and core cutting and forced inwardly by the downward movement of said inner tubular member, substantially as and for the purpose described.

' 7 In a core drill, in combination, an inner tubular member adapted to be turned by a well drill pipe, cam. elements thereon, a plurality of body members around said tubular member with interconnections revoluble member longitudinally,

retaining devices adapted to be whereby said cam elements alternately and intermittently lift and drop said body members, 'drill bits on said body members, means holding core cutting devices around the central opening of said core drill, said core cutting devices being adapted to be forced inwardly into a. core by the movement of said inner tubular member, and means for intermittently holding said body members from turning relative to said inner tubular member, substantially as described.

8. In a core drilldrilling elements adapted to be turned and to be alternately and 1ntermittently raised and dropped, a revoluble member having means for raising and dropping said drilling elements as said revoluble member is revolved, .core cutting devices operable to cut and support a core within sa1d device, said core cutting devices being. adapted to be operated by the movement of said and means for connecting a drill pipe to said revoluble member for operating said drilling elements. v

9. In a core drill, in combination, a central tubular member, bodymembersaround the same and connected thereto to move therewith and to move longitudinally relative thereto, means on said tubular member for lifting and dropping said body members intermittently, drill bits detachably secured to the bottoms of said body members, means associated therewith for biting off a core and supporting the same within said core drill, said means being operable by the relative movement of said tubular member and,

said body members and said core biting means, and means for holding said body members intermittently from turning with said central tubular member and during the lifting action on said body members, substantially as described.

10. In a core drill, in combination, a. tu bular member having spiral cam elements thereon, a plurality of body members around said tubular member and connected to be raised and lowered by said cam ele-' ments as said tubular member is rotated relative thereto, means for intermittently holding said body members from turning,

'said means being operated by said tubular drill bits detachably connected to the lower ends of said body members, core cutting devices adapted to be forced inwardly by the movement of said tubular member longitudinally,. and springs for forcing said body members downwardly as they are releasedby said cam elements after being raised, substantially as shown and described.

Signed member,

h at LOs Angeles, Los Angeles County, California, this 7th day of January 1925' JAMFs w IOY 

